Checkout of Instiki Trunk 1/21/2007.

vendor/rails/actionmailer/lib/action_mailer/part_container.rb

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+module ActionMailer
+  # Accessors and helpers that ActionMailer::Base and ActionMailer::Part have
+  # in common. Using these helpers you can easily add subparts or attachments
+  # to your message:
+  #
+  #   def my_mail_message(...)
+  #     ...
+  #     part "text/plain" do |p|
+  #       p.body "hello, world"
+  #       p.transfer_encoding "base64"
+  #     end
+  #
+  #     attachment "image/jpg" do |a|
+  #       a.body = File.read("hello.jpg")
+  #       a.filename = "hello.jpg"
+  #     end
+  #   end
+  module PartContainer
+    # The list of subparts of this container
+    attr_reader :parts
+
+    # Add a part to a multipart message, with the given content-type. The
+    # part itself is yielded to the block so that other properties (charset,
+    # body, headers, etc.) can be set on it.
+    def part(params)
+      params = {:content_type => params} if String === params
+      part = Part.new(params)
+      yield part if block_given?
+      @parts << part
+    end
+
+    # Add an attachment to a multipart message. This is simply a part with the
+    # content-disposition set to "attachment".
+    def attachment(params, &block)
+      params = { :content_type => params } if String === params
+      params = { :disposition => "attachment",
+                 :transfer_encoding => "base64" }.merge(params)
+      part(params, &block)
+    end
+
+    private
+    
+      def parse_content_type(defaults=nil)
+        return [defaults && defaults.content_type, {}] if content_type.blank?
+        ctype, *attrs = content_type.split(/;\s*/)
+        attrs = attrs.inject({}) { |h,s| k,v = s.split(/=/, 2); h[k] = v; h }
+        [ctype, {"charset" => charset || defaults && defaults.charset}.merge(attrs)]
+      end
+
+  end
+end